For but one counterexample among many, look at where we get our oil. Saudi Arabia is one of the most tyrannical oppressive and regressive societies, but that's all perfectly fine to the powers that be so long as they keep the oil moving. And I don't think this is really hypocritical.
The entire reason society works, or worked, is because people were willing to put aside their differences, regardless of how extreme, to engage in behaviors that were mutually beneficial. Start judging people based on adherence to your own politics and you'll find that, sooner or later, everybody will be your enemy.
There are hundreds of thousands, possibly millions, of people who do not regard Saudi oppression as "perfectly fine" regardless of which chemicals they offer for sale. I don't really accept this counterargument, since overlooking human rights abuses is one of the most common complaints about organizations like the UN, the United States government, and countless other political bodies.
As far as your second paragraph, in your framework society never really worked, which conveniently explains why there has always been war in some part of the world as far back as anyone can remember.
What people individually think has little to do with who is considered an ally and who is considered an enemy. These are decisions made by our "representative" governments which ultimately shapes society. In a democracy your voice is defined by what you vote for. As people keep voting for people that are more than happy to buddy buddy with anybody, regardless of how awful, so long as they are geopolitically obsequious, then that is the status quo of "society."
And there will always be war for the same reason there will always be murder. I would argue that rather than trying to frame a society around the concept of preventing war, it may be more pragmatic to try to minimize the impact of war such that otherwise minor conflicts between two nations don't end up dragging the entire world to war, for what is always framed as some greater good, but invariably just results in exponentially more death and destruction with far less than nothing to show for it.
The entire reason society works, or worked, is because people were willing to put aside their differences, regardless of how extreme, to engage in behaviors that were mutually beneficial. Start judging people based on adherence to your own politics and you'll find that, sooner or later, everybody will be your enemy.